Tetrahydrozoline is a form of a medicine called imidazoline, which is found in over-the-counter eye drops and nasal sprays. Tetrahydrozoline poisoning occurs when someone accidentally or intentionally swallows this product.

This is for information only and not for use in the treatment or management of an actual poison exposure. If you have an exposure, you should call your local emergency number (such as 911) or the National Poison Control Center at 1-800-222-1222.

• Tetrahydrozoline

Tetrahydrozoline is sold under the following brand names:

• Eyesine
• Geneye
• Murine Tears Plus
• Optigene 3
• Tyzine
• Visine Original and Advanced Relief

Note: This list may not be all-inclusive.

• Airways and lungs
  • Difficulty breathing
  • No breathing
• Eyes and skin
  • Blurred vision
  • Blue lips and fingernails
  • Change in pupil size
• Heart
  • High blood pressure (at first)
  • Low blood pressure (later)
  • Rapid heartbeat
• Stomach and intestines
  • Nausea
  • Vomiting
• Nervous system
  • Coma
  • Headache
  • Irritability
  • Nervousness
  • Tremors
  • Seizures
• Other
  • Low body temperature